Non-oxidiser percarbonate particles

A technology of sodium percarbonate and particles, which is applied in the direction of peroxide/peroxy hydrate/peroxyacid/superoxide/ozonide, inorganic chemistry, non-metallic elements, etc. It can solve the problems affecting the washing performance of preparations, etc. To achieve the effect of safe storage

Active Publication Date: 2010-01-06
索尔维珀萨尔兹有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although these coatings generally improve the long-term stability of the percarbonate, they often introduce additional foreign components into the detergent composition, which not only should be avoided in terms of environmental considerations, but may also Interacts with detergent components and thus negatively affects the wash performance of the resulting formulation

Method used

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  • Non-oxidiser percarbonate particles

Examples

Experimental program
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Effect test

Embodiment Construction

[0069] In a Glatt laboratory spray dryer with approximately 40% Na 2 CO 3 1600 g of uncoated sodium percarbonate (PCS) having an average particle size of about 700 μm was coated.

[0070] Raw material: 1600g PCS

[0071] Coating agent: Na 2 CO 3

[0072] Coating degree: 40%

[0073] Coating weight: 915g Na 2 CO 3

[0074] Concentration of coating solution: 25%

[0075] Air pressure: 2.5 bar

[0076] Spray pressure: 1.8 bar

[0077] Temperature under the bed: 100°C-110°C

[0078] Temperature above the bed: 50°C-55°C

[0079] Coating time: about 90 minutes

[0080] Drying time: 9 minutes

[0081] Drying temperature: 70°C

[0082] The coated PCS had an AvOx of 7.53% and a water content of 6.4% measured with the Karl Fischer method (using Aqua 40 from Jena-Analytik at a constant value of 70°C).

[0083] Other samples were post-dried to lower moisture contents.

[0084] Prepare four samples:

[0085] Sample 1:

[0086] Avox is 7.53%, water content: 6.4%

[0087]...

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Abstract

Non-oxidiser particles containing sodium percarbonate and at least one additive, the amount of constituents other than sodium percarbonate in the particles being such that the particles are classified as non-oxidiser according to the standard test method O.1 of the UN Manual of Tests and Criteria, sub-section 34.4.1 and that the particles have an available oxygen content of below 12 % by weight, wherein the sodium perc arbonate is coated and / or co-granulated with the additive(s). Blends comprising such particles. Process for the production of these particles and blends. Use of these particles or blends in detergent compositions and detergent compos i tions containing them.

Description

[0001] This application claims the benefit of European Patent Application filed on December 29, 2006 with serial number 06127376.9. technical field [0002] This invention relates generally to percarbonate-containing granules, and more particularly to sodium percarbonate granules with improved stability. Background technique [0003] Sodium percarbonate (or sodium carbonate peroxyhydrate) is well known for use as a bleaching agent in detergent compositions for domestic linen or dishwashing. Typically such detergent compositions comprise, inter alia, zeolites (as builder materials), enzymes, bleach activators and / or perfumes. However, during storage and transport of the composition, interactions between sodium percarbonate and other formulation components lead to progressive decomposition of the percarbonate and thus loss of bleaching power. [0004] Many proposals have been made to overcome this problem, for example by inserting layers, called coatings, between the sodium p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11D3/10C11D3/39C11D7/12
CPCC01B15/106C11D3/3942C11D7/12C11D3/10C11D17/0039C11D17/06
Inventor 于尔根·H·拉贝亨克·L·J·文布鲁克斯约尔格·克莱门斯格尔德·黑肯贝恩德·霍夫曼
Owner 索尔维珀萨尔兹有限公司
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